E cigarettes may not contain tobacco, but they still deliver nicotine, a highly addictive substance that can harm the developing brain, increase blood pressure, and lead to long term addiction. Many also contain toxic E cigs could be more harmful to CV health than traditional cigarettes Misconceptions Over The Safety Of Vaping and E Cigs Is Risking Lives Ecigclick World Tobacco Day E Cigarettes Vaping Can Be More Harmful Than Regular Cigarettes Can Cause Lung Injury Experts Say